<div dir="ltr">The reason is that per stress calculations what really counts is the moment of inertia around the intersection of stiffener and shell. That means the material further from that intersection contributes much more than the material closer to it. To visualize this intuitively, imagine a stiffener made by bending a flat bar the "easy way" versus a stiffener that is cut out of a flat ring and is therefore much deeper. Both rings might weigh the same, but the one that's bent the easy way and has its center of mass close to the shell does a whole lot less stiffening than the deep ring of the same weight. Now taking the same logic further, the most efficient configuration is a substantial flange that is held well off the shell by a deep web, even if the web is not very thick. <div><br></div><div>Best,</div><div>Alec</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 12, 2018 at 5:27 PM, hank pronk via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div></div>
<div>Ian,</div><div>Why T rings, it might be cheaper and for sure super accurate to cut rings from plate. You can have rings cut in halves or thirds to save material. Gamma has solid rings internal instead of T bars. Just an option.</div><div>Hank</div><div><br></div>
</div><div><div class="h5"><div id="m_-6972132328772307053yahoo_quoted_9340732458" class="m_-6972132328772307053yahoo_quoted">
<div style="font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;font-size:13px;color:#26282a">
<div>
On Tuesday, June 12, 2018, 3:08:52 PM MDT, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div dir="ltr">Ian,<br></div><div dir="ltr"> What I did was to order vertical and horizontal rings and weld them.<br></div><div dir="ltr"><br></div><div dir="ltr">Brian<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a> wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">From: irox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br></div><div dir="ltr">To: <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a><br></div><div dir="ltr">Subject: [PSUBS-MAILIST] Cold verses Hot rolled Tee rings ?<br></div><div dir="ltr">Date: Tue, 12 Jun 2018 11:15:52 -0700 (GMT-07:00)<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Hi sub folks,<br></div><div dir="ltr"><br></div><div dir="ltr">for my K250 (VAST MKIII type) resto-mod I'm planning on adding external re-enforcing rings.<br></div><div dir="ltr"><br></div><div dir="ltr">I recently got a quote for some hot rolled T rings (1-1/2 x 1-1/2 x 1/4 OD 39" out-of-round tolerance %1) for ~$800 + shipping. Since it was the only place that replied to my quote request, I'm thinking of going with them.<br></div><div dir="ltr"><br></div><div dir="ltr">I know cold rolled is dimensionally more accurate, but is going with hot rolled going to cause me issues?<br></div><div dir="ltr"><br></div><div dir="ltr">Thanks,<br></div><div dir="ltr"> Ian. <br></div><div dir="ltr">______________________________<wbr>_________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">______________________________<wbr>_________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br></div></div>
</div>
</div></div></div></div></div><br>______________________________<wbr>_________________<br>
Personal_Submersibles mailing list<br>
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
<br></blockquote></div><br></div>